Foldable pen



FIG. 1 is a front elevational view of a foldable pen showing my newdesign, the opposite side being a mirror image thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof; and

FIG. 5 is a left side elevational view thereof.

The ornamental design for a foldable pen, as shown and described.